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Unformatted text preview: Practice Exam No. 2 1. Creep behavior of a material is given below where “X” denotes a failure. (a) If curves A, B and C were obtained at different temperature at constant stress, list, from high to low, the temperature at which these creep curves were obtained. (b) Similarly, if curves A, B and C were obtained at different stress levels at constant temperature, list, from high to low, the stress at which these creep curves were obtained. Creep Strain Time X X X A B C Creep Strain Time X X X A B C 2. Consider 1.0 kg of austenite containing 1.5 wt.% Carbon, cooled to below 727 ° C. Note that AW Fe =55.85 g/mole and AW C =12 g/mole. (a) What is the proeutectoid phase (phase formed before eutectoid reaction)? (b) How many kg’s each of total ferrite and cementite form? (c) How many kg’s each of pearlite and the proeutectoid phase form? (d) Schematically sketch and label the resulting microstructure. 3. A cylindrical specimen of stainless steel having a diameter of 12.8 mm and a gauge length of 50.8 A cylindrical specimen of stainless steel having a diameter of 12....
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